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Table 2 Quality of sleep measured by PSQI scores in the studied population

From: Psychosocial issues and sleep quality among seafarers: a mixed methods study

Components Total Mean (SD) Shift work
Mean (SD)
Education
Mean (SD)
Marital status
Mean (SD)
Day work Shift work Non- academic Academic Single Married
Comp.1: Sleep quality 0.23 (0.50) 0.25 (0.44) 0.22 (0.05) 0.24 (0.56) 0.24 (0.50) 0.32 (0.71) 0.21 (0.41)
Comp.2: Sleep latency 1.39 (0.91) 1.3 (0.93) 1.43 (0.90) 0.98 (0.77) a 1.51 (0.92) a 1.26 (0.93) 1.42 (0.90)
Comp.3: Sleep duration 1.14 (0.85) 0.92 (0.62) a 1.23 (0.92) a 0.73 (0.53) a 1.36 (0.95) a 1.09 (0.83) 1.15 (0.85)
Comp.4: Sleep efficiency 0.48 (1.01) 0.25 (0.74) a 0.57 (1.09) a 0.10 (0.30) a 0.71 (1.21) a 0.39 (0.90) 0.50 (1.04)
Comp.5: Sleep disturbance 0.96 (0.57) 1 (0.56) 0.94 (0.58) 0.74 (0.56) a 1.05 (0.53) a 0.84 (0.65) 0.98 (0.54)
Comp.6: Use of sleep medication 0.03 (0.17) 0.06 (0.24) 0.02 (0.13) 0.06 (0.24) 0.02 (0.15) 0.00 (0.00) 0.04 (0.20)
Comp.7: Daytime dysfunction 1.68 (0.54) 1.63 (0.48) 1.70 (0.57) 1.68 (0.58) 1.66 (0.56) 1.79 (0.51) 1.64 (0.56)
Global PSQI Score 5.92 (2.59) 5.32 (1.90) 6.17 (2.80) 4.64 (1.65) a 6.52 (2.85) a 5.70 (2.80) 5.96 (2.56)
OR (Global PSQI Score more than 5)   1 1.15 (0.57–2.32) 1 4.17 (1.97–8.85) 1 1.81 (0.88–3.72)
Component1: #9 Score
Component2: #2 Score (≤15 min = 0; 16–30 min = 1; 31–60 min = 2, > 60 min = 3) + #5a Score
(if sum is equal 0 = 0; 1–2 = 1; 3–4 = 2; 5–6 = 3)
Component3: #4 Score (> 7 = 0; 6–7 = 1; 5–6 = 2; < 5 = 3)
Component4: (total # of hours asleep)/ (total # of hours in bed) × 100
> 85% = 0, 75–84% = 1, 65–74% = 2, < 65% = 3
Component5: Sum of Scores #5b to #5j (0 = 0; 1–9 = 1; 10–18 = 2; 19–27 = 3)
Component6: #6 Score
Component7: #7 Score + #8 Score (0 = 0; 1–2 = 1; 3–4 = 2; 5–6 = 3)
  1. aDifference is statistically significant at level of 0.05 according to two samples t-test